A Method for Asphalt Mixture Water Stability Evaluation

Abstract

The invention discloses an aquatic mixture water-stability evaluation method. The method comprises the following steps: arranging and forming two groups of prismatic mixture test pieces, ultrasonically oscillating and circulating one group of test pieces at the environment of -20 to 60 DEG C so as to quickly simulate emulsification, scouring and frost heaving effect of ice at low-temperature on the asphalt by the water, particles and like in the mixture under a load effect; performing strength testing on each of two groups of test pieces, firstly simulating the extrusion and peeling process between aggregates under the load effect, realizing the internal structure looseness of the mixture, wherein the looseness is represented as S, then applying breakdown pressure F to represent the capacity of resisting the external load by the internal of the mixture, and finally representing the advantage and the disadvantage of the mixture water stability as F / S of two groups of test pieces. The evaluation method disclosed by the invention can accelerate the simulation of breakdown process on the asphalt pavement under the load, the moisture, the particles, the temperature and like element coupling effects, and the test efficiency is improved; the influences on the mixture water stability by the external breakdown load and the internal looseness are coupled through the evaluation method, and the result is more scientific.

Description

technical field [0001] The invention relates to the technical field of asphalt engineering, in particular to a method for evaluating the water stability of asphalt mixture. Background technique [0002] The evaluation of the water stability of asphalt mixture in the current specification mainly adopts freeze-thaw splitting test, submerged Marshall test and submerged rutting test. None of the above methods can reflect the actual situation, that is, it is impossible to simulate the scouring and emulsification of the asphalt film by the moisture inside the mixture under the action of the vehicle load, which leads to the inconsistency between the evaluation results in the laboratory and the actual project. [0003] In recent years, some improved evaluation methods have gradually appeared around the freeze-thaw splitting test. Water erosion tests on asphalt mixtures are mainly carried out by scouring with alternating pressure changes. Compared with the conventional method, this...

AI Technical Summary

Problems solved by technology

Existing simulation methods only conduct tests at extreme temperatures of -18°C and 60°C, ignoring the influence of cumulative gradual changes, and cannot simulate the change process of pavement under interannual temperatures

The test results still only use the compressive strength as the evaluation index of water damage resistance, without considering the influence of the internal looseness of the mixture on the water stability

Not only that, but the test cycle is long, making quick evaluation impossible

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